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Discovered: June 16, 2003
Updated: February 13, 2007 12:01:57 PM
Type: Trojan Horse
Systems Affected: Windows

BAT.Karal.A is a simple Trojan Horse.

When BAT.Karal.A is executed, it does the following:

  • Rewrites the C:\Windows\System.ini file with one contained within itself.
  • Create the file, C:\Windows\E.vbs. All the paths are hard-coded in the Trojan.

    When E.vbs is run, it will display several messages. Then, this Trojan modifies the E.vbs file by adding a few lines at the top. These lines do not do anything.
The Trojan Horse does nothing else to the system.

Antivirus Protection Dates

  • Initial Rapid Release version June 16, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version June 16, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date June 18, 2003

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Writeup By: Neal Hindocha